Portable monitor



FIG. 1 is a side perspective view of a portable monitor;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is an opposite side view of FIG. 1;

FIG. 5 is a top perspective view of FIG. 1; and,

FIG. 6 is a bottom perspective view of FIG. 1.

Broken lines shown in the drawings illustrate portions of the portable monitor and form no part of the claimed design. 

I claim the ornamental design for a portable monitor, as shown and described. 